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US 4,364,502 AGranted
Line sensor arrangement
AssigneeMilliken Research Corporation
InventorZane Frentress
Life of this patent
Estimating the term…
Abstract
A rotating magnetic sensor which detects a ferrous line on a web of material and compares it with a reference registration line to either speed up or slow down the speed of the section of web material on which the ferrous line is located. The sensor employs a pole-piece, a coil, a permanent magnet and two signal wires.
Claims1
A magnetic sensor to detect a ferrous mark on a moving web of material comprising:
- a substantially cylindrical housing having a central axis, a sensor mounted in said housing, said sensor having a permanent magnet mounted therein, a pole piece mounted in said sensor adjacent said permanent magnet having its centerline offset from the centerline of said cylindrical housing, a coil in said pole piece adjacent one end of said housing and a plurality of wires connected to and projecting from said sensor to provide a connection means to transmit a voltage generated when said sensor is rotated around a ferrous material.
Dependencies are inferred from the claim text.